1 files changed, 92 insertions, 0 deletions
diff --git a/payloads/libpayload/i386/timer.c b/payloads/libpayload/i386/timer.c
new file mode 100644
index 0000000000..72a3ee8f48
--- /dev/null
+++ b/payloads/libpayload/i386/timer.c
@@ -0,0 +1,92 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2008 Advanced Micro Devices, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <libpayload.h>
+#include <arch/rdtsc.h>
+
+static unsigned int cpu_khz;
+
+/* Calculate the speed of the processor for use in delays */
+
+void get_cpu_speed(void)
+{
+	unsigned long long start, end;
+
+	/* Set up the PPC port - disable the speaker, 
+	 * enable the T2 gate */
+	
+	outb((inb(0x61) & ~0x02) | 0x01, 0x61);
+
+	/* Set the PIT to Mode 0, counter 2, word access */
+	outb(0xB0, 0x43);
+
+	/* Load the counter with 0xFFFF */
+	
+	outb(0xFF, 0x42);
+	outb(0xFF, 0x42);
+
+	/* Read the number of ticks during the period */
+
+	start = rdtsc();
+	while(!(inb(0x61) & 0x20));
+	end = rdtsc();
+
+	/* The clock rate is 1193180 Hz
+	* the number of miliseconds for a period
+	* of 0xFFFF is 1193180 / (0xFFFF * 1000)
+	* or .0182.  Multiply that by the number of 
+	* measured clocks to get the khz value 
+	*/
+
+	cpu_khz =
+		(unsigned int ) ((end - start) * 1193180U / (1000 * 0xFFFF));
+}
+
+/* Global delay functions */
+
+static inline void _delay(unsigned int delta)
+{
+	unsigned long long timeout = rdtsc() + delta;
+	while (rdtsc() < timeout);
+}
+
+void ndelay(unsigned int n)
+{
+ 	_delay(n * cpu_khz / 1000000);
+}
+
+void mdelay(unsigned int m)
+{
+	_delay(m * cpu_khz);
+}
+
+void delay(unsigned int s)
+{
+	_delay(s * cpu_khz * 1000);
+}